The Class President of 1-A, Kazukiyo suffers from nyctophobia and a fear of just about anything else that is scary. He has romantic feelings for Class 1-A's Vice President, Momoka, whom he has known for years, but he is initially too shy to come out and say anything. Hikaru and Kaoru comment that he is the kind of person with pure feelings who they can't tease, possibly because he is more emotionally vulnerable than Tamaki. In the manga, he unwittingly caused Haruhi some problems when he became top of his cohort.